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/* Copyright (C) 2016 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include "contrib/dnstap/convert.h"
#include "contrib/dnstap/dnstap.pb-c.h"
/*!
* \brief Translation between real and Dnstap value.
*/
typedef struct mapping {
int real;
int dnstap;
} mapping_t;
/*!
* \brief Mapping for network family.
*/
static const mapping_t SOCKET_FAMILY_MAPPING[] = {
{ AF_INET, DNSTAP__SOCKET_FAMILY__INET },
{ AF_INET6, DNSTAP__SOCKET_FAMILY__INET6 },
{ 0 }
};
/*!
* \brief Mapping from network protocol.
*/
static const mapping_t SOCKET_PROTOCOL_MAPPING[] = {
{ IPPROTO_UDP, DNSTAP__SOCKET_PROTOCOL__UDP },
{ IPPROTO_TCP, DNSTAP__SOCKET_PROTOCOL__TCP },
{ 0 }
};
/*!
* \brief Get Dnstap value for a given real value.
*/
static int encode(const mapping_t *mapping, int real)
{
for (const mapping_t *m = mapping; m->real != 0; m += 1) {
if (m->real == real) {
return m->dnstap;
}
}
return 0;
}
/*!
* \brief Get real value for a given Dnstap value.
*/
static int decode(const mapping_t *mapping, int dnstap)
{
for (const mapping_t *m = mapping; m->real != 0; m += 1) {
if (m->dnstap == dnstap) {
return m->real;
}
}
return 0;
}
/* -- public API ----------------------------------------------------------- */
Dnstap__SocketFamily dt_family_encode(int family)
{
return encode(SOCKET_FAMILY_MAPPING, family);
}
int dt_family_decode(Dnstap__SocketFamily dnstap_family)
{
return decode(SOCKET_FAMILY_MAPPING, dnstap_family);
}
Dnstap__SocketProtocol dt_protocol_encode(int protocol)
{
return encode(SOCKET_PROTOCOL_MAPPING, protocol);
}
int dt_protocol_decode(Dnstap__SocketProtocol dnstap_protocol)
{
return decode(SOCKET_PROTOCOL_MAPPING, dnstap_protocol);
}
bool dt_message_type_is_query(Dnstap__Message__Type type)
{
switch (type) {
case DNSTAP__MESSAGE__TYPE__AUTH_QUERY:
case DNSTAP__MESSAGE__TYPE__CLIENT_QUERY:
case DNSTAP__MESSAGE__TYPE__FORWARDER_QUERY:
case DNSTAP__MESSAGE__TYPE__RESOLVER_QUERY:
case DNSTAP__MESSAGE__TYPE__STUB_QUERY:
case DNSTAP__MESSAGE__TYPE__TOOL_QUERY:
return true;
default:
return false;
}
}
bool dt_message_type_is_response(Dnstap__Message__Type type)
{
switch (type) {
case DNSTAP__MESSAGE__TYPE__AUTH_RESPONSE:
case DNSTAP__MESSAGE__TYPE__CLIENT_RESPONSE:
case DNSTAP__MESSAGE__TYPE__FORWARDER_RESPONSE:
case DNSTAP__MESSAGE__TYPE__RESOLVER_RESPONSE:
case DNSTAP__MESSAGE__TYPE__STUB_RESPONSE:
case DNSTAP__MESSAGE__TYPE__TOOL_RESPONSE:
return true;
default:
return false;
}
}
bool dt_message_role_is_initiator(Dnstap__Message__Type type)
{
switch (type) {
case DNSTAP__MESSAGE__TYPE__AUTH_QUERY:
case DNSTAP__MESSAGE__TYPE__AUTH_RESPONSE:
case DNSTAP__MESSAGE__TYPE__CLIENT_QUERY:
case DNSTAP__MESSAGE__TYPE__CLIENT_RESPONSE:
return false;
default:
return true;
}
}
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